Machine head obstacle clearing method

Abstract

The invention relates to a machine head obstacle clearing method, and belongs to the technical field of underground space development and construction. The machine head obstacle clearing method comprises the following steps of (1) determining an axis and an elevation; (2) previously preparing for installing a reversed large-diameter pipe, arranging force transfer ejector iron and a guide rail in another foundation pit, arranging a hydraulic cylinder on the force transfer ejector iron, placing a large-diameter pipe with the diameter being larger than the diameter of an original pipeline onto the guide rail, and enabling the axes of the large-diameter pipe and the original pipeline to be consistent; (3) installing the reversed large-diameter pipe, reversely pressing the large-diameter pipe into a soil layer section by section in a length direction of the original pipeline, and excavating and carrying away soil on the front surface of the large-diameter pipe until excavating to an obstacle part; (4) moving the obstacle out, enabling a worker to enter from the inside of the large-diameter pipe to arrive at the obstacle part, crushing the obstacle and carrying away the obstacle from theinside of the large-diameter pipe; (5) continuously installing the original pipeline; and (6) filling a gap. The machine head obstacle clearing method provided by the invention has the advantage thatthe obstacle can be cleared without the need for re-excavating the foundation pit.

Description

technical field [0001] The invention relates to the technical field of underground space development and construction, in particular to a machine head obstacle removal method. Background technique [0002] The pipe jacking method refers to an underground excavation construction method used when tunnels or underground pipelines cross various obstacles such as railways, roads, rivers or buildings. During construction, a foundation pit is excavated at both ends of the construction section, and then a force-transmitting top iron and guide rails are set in the foundation pit, and the pipe is pressed into the soil layer with a hydraulic jack supported on the back seat of the foundation pit and moved toward With the opening of another foundation pit, the soil on the front of the pipe is excavated and transported away. When the first section of pipe is fully pushed into the soil layer, then the second section of pipe is connected to the back and continues to be pushed in. In this w...

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Problems solved by technology

[0003] In the process of pipe jacking construction, a machine head for digging soil is generally installed on the front of the first pipe section to speed up the excavation efficiency. However, when there are hard obstacles in the soil layer, the machine head cannot drill. At this time, the third foundation pit can only be re-excavated on the ground at the top of the obstacle until the obstacle is dug, and the third foundation pit can be refilled after the obstacle is broken.

[0004] However, the above-mentioned obstacle removal method has a disadvantage in that it is very time-consuming and laborious to dig the foundation pit again. If the pipe jacking is constructed at the traffic arteries, re-dig the foundation pit on the surface will seriously affect the traffic environment here, which is very difficult for the commuters. bring inconvenience

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